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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/client/connection_string.h"
#include "mongo/db/repl/optime.h"
#include "mongo/platform/mutex.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/client/shard_registry.h"
namespace mongo {
class NamespaceString;
struct ReadPreferenceSetting;
class VersionType;
namespace executor {
class TaskExecutor;
} // namespace executor
/**
* Implements the catalog client for reading from replica set config servers.
*/
class ShardingCatalogClientImpl final : public ShardingCatalogClient {
public:
ShardingCatalogClientImpl();
virtual ~ShardingCatalogClientImpl();
/*
* Updates (or if "upsert" is true, creates) catalog data for the sharded collection "collNs" by
* writing a document to the "config.collections" collection with the catalog information
* described by "coll."
*/
static Status updateShardingCatalogEntryForCollection(OperationContext* opCtx,
const NamespaceString& nss,
const CollectionType& coll,
const bool upsert);
DatabaseType getDatabase(OperationContext* opCtx,
StringData db,
repl::ReadConcernLevel readConcernLevel) override;
std::vector<DatabaseType> getAllDBs(OperationContext* opCtx,
repl::ReadConcernLevel readConcern) override;
CollectionType getCollection(OperationContext* opCtx,
const NamespaceString& nss,
repl::ReadConcernLevel readConcernLevel) override;
std::vector<CollectionType> getCollections(OperationContext* opCtx,
StringData db,
repl::ReadConcernLevel readConcernLevel) override;
std::vector<NamespaceString> getAllShardedCollectionsForDb(
OperationContext* opCtx, StringData dbName, repl::ReadConcernLevel readConcern) override;
StatusWith<std::vector<std::string>> getDatabasesForShard(OperationContext* opCtx,
const ShardId& shardName) override;
StatusWith<std::vector<ChunkType>> getChunks(
OperationContext* opCtx,
const BSONObj& query,
const BSONObj& sort,
boost::optional<int> limit,
repl::OpTime* opTime,
repl::ReadConcernLevel readConcern,
const boost::optional<BSONObj>& hint = boost::none) override;
std::pair<CollectionType, std::vector<ChunkType>> getCollectionAndChunks(
OperationContext* opCtx,
const NamespaceString& nss,
const ChunkVersion& sinceVersion,
const repl::ReadConcernArgs& readConcern) override;
StatusWith<std::vector<TagsType>> getTagsForCollection(OperationContext* opCtx,
const NamespaceString& nss) override;
StatusWith<repl::OpTimeWith<std::vector<ShardType>>> getAllShards(
OperationContext* opCtx, repl::ReadConcernLevel readConcern) override;
Status runUserManagementWriteCommand(OperationContext* opCtx,
StringData commandName,
StringData dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
bool runUserManagementReadCommand(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmdObj,
BSONObjBuilder* result) override;
Status applyChunkOpsDeprecated(OperationContext* opCtx,
const BSONArray& updateOps,
const BSONArray& preCondition,
const NamespaceStringOrUUID& nsOrUUID,
const NamespaceString& nss,
const ChunkVersion& lastChunkVersion,
const WriteConcernOptions& writeConcern,
repl::ReadConcernLevel readConcern) override;
StatusWith<BSONObj> getGlobalSettings(OperationContext* opCtx, StringData key) override;
StatusWith<VersionType> getConfigVersion(OperationContext* opCtx,
repl::ReadConcernLevel readConcern) override;
Status insertConfigDocument(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& doc,
const WriteConcernOptions& writeConcern) override;
void insertConfigDocumentsAsRetryableWrite(OperationContext* opCtx,
const NamespaceString& nss,
std::vector<BSONObj> docs,
const WriteConcernOptions& writeConcern) override;
StatusWith<bool> updateConfigDocument(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& query,
const BSONObj& update,
bool upsert,
const WriteConcernOptions& writeConcern) override;
Status removeConfigDocuments(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& query,
const WriteConcernOptions& writeConcern,
boost::optional<BSONObj> hint = boost::none) override;
StatusWith<std::vector<KeysCollectionDocument>> getNewKeys(
OperationContext* opCtx,
StringData purpose,
const LogicalTime& newerThanThis,
repl::ReadConcernLevel readConcernLevel) override;
private:
/**
* Updates a single document (if useMultiUpdate is false) or multiple documents (if
* useMultiUpdate is true) in the specified namespace on the config server. Must only be used
* for updates to the 'config' database.
*
* This method retries the operation on NotPrimary or network errors, so it should only be used
* with modifications which are idempotent.
*
* Returns non-OK status if the command failed to run for some reason. If the command was
* successful, returns true if a document was actually modified (that is, it did not exist and
* was upserted or it existed and any of the fields changed) and false otherwise (basically
* returns whether the update command's response update.n value is > 0).
*/
static StatusWith<bool> _updateConfigDocument(OperationContext* opCtx,
const NamespaceString& nss,
const BSONObj& query,
const BSONObj& update,
bool upsert,
const WriteConcernOptions& writeConcern);
StatusWith<repl::OpTimeWith<std::vector<BSONObj>>> _exhaustiveFindOnConfig(
OperationContext* opCtx,
const ReadPreferenceSetting& readPref,
const repl::ReadConcernLevel& readConcern,
const NamespaceString& nss,
const BSONObj& query,
const BSONObj& sort,
boost::optional<long long> limit,
const boost::optional<BSONObj>& hint = boost::none) override;
/**
* Queries the config servers for the database metadata for the given database, using the
* given read preference. Returns NamespaceNotFound if no database metadata is found.
*/
StatusWith<repl::OpTimeWith<DatabaseType>> _fetchDatabaseMetadata(
OperationContext* opCtx,
const std::string& dbName,
const ReadPreferenceSetting& readPref,
repl::ReadConcernLevel readConcernLevel);
};
} // namespace mongo
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